SR540 / SR800 Extension Tube – Free 1 lb Coffee (Limited Time)
SR540 / SR800 Extension Tube – Free 1 lb Coffee (Limited Time)
SR540 / SR800 Extension Tube – Free 1 lb Coffee (Limited Time)
SR540 / SR800 Extension Tube – Free 1 lb Coffee (Limited Time)
SR540 / SR800 Extension Tube – Free 1 lb Coffee (Limited Time)
SR540 / SR800 Extension Tube – Free 1 lb Coffee (Limited Time)
SR540 / SR800 Extension Tube – Free 1 lb Coffee (Limited Time)
SR540 / SR800 Extension Tube – Free 1 lb Coffee (Limited Time)
SR540 / SR800 Extension Tube – Free 1 lb Coffee (Limited Time)
SR540 / SR800 Extension Tube – Free 1 lb Coffee (Limited Time)
SR540 / SR800 Extension Tube – Free 1 lb Coffee (Limited Time)
SR540 / SR800 Extension Tube – Free 1 lb Coffee (Limited Time)
SR540 / SR800 Extension Tube – Free 1 lb Coffee (Limited Time)
SR540 / SR800 Extension Tube – Free 1 lb Coffee (Limited Time)
SR540 / SR800 Extension Tube – Free 1 lb Coffee (Limited Time)
SR540 / SR800 Extension Tube – Free 1 lb Coffee (Limited Time)
SR540 / SR800 Extension Tube – Free 1 lb Coffee (Limited Time)
SR540 / SR800 Extension Tube – Free 1 lb Coffee (Limited Time)
SR540 / SR800 Extension Tube – Free 1 lb Coffee (Limited Time)
SR540 / SR800 Extension Tube – Free 1 lb Coffee (Limited Time)
SR540 / SR800 Extension Tube – Free 1 lb Coffee (Limited Time)
SR540 / SR800 Extension Tube – Free 1 lb Coffee (Limited Time)
SR540 / SR800 Extension Tube – Free 1 lb Coffee (Limited Time)
SR540 / SR800 Extension Tube – Free 1 lb Coffee (Limited Time)

SR540 / SR800 Extension Tube – Free 1 lb Coffee (Limited Time)

$79.00
Free Pound Of Beans: SR540/800 EXT + FREE 1 lb Brazil Guaxupe (Limited Time)
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Estimate delivery times: 3-6 days (United States), 12-26 days (International)

Return within 10 days of purchase. Duties & taxes are non-refundable.

How to Purchase Fresh roast SR800

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SR540 / SR800 Extension Tube – Free 1 lb Coffee (Limited Time)
SR540 / SR800 Extension Tube – Free 1 lb Coffee (Limited Time)
$79.00

SR540 / SR800 Glass Extension Tube

Includes: 10.25" Glass Extension Tube, high-temperature silicone base bands, and double-lip midsection seal
Bonus (Limited Time): Select variants include 1 FREE pound of green coffee
Compatibility: Fits Fresh Roast SR540 and SR800
Warranty: Six-Month Manufacturer Warranty

Improved Airflow and Roast Efficiency

The SR540 and SR800 Extension Tube are the same model and fit both roasters. This 10.25" glass extension tube improves bean movement and airflow when used with the original roasting chamber and chaff basket.

By increasing chamber height and optimizing air velocity, the extension tube allows the roaster to operate at lower fan and heat settings as beans lose weight during roasting. Many users finish around Fan 2 / Heat 1, depending on the environment and voltage conditions.

This upgrade is especially useful for customers roasting in cooler environments or with slightly lower supply voltage.

Limited-Time Bonus

Select options include 1 complimentary pound of green coffee.

Choose your preferred origin from the dropdown menu.
Offer available while supplies last.

(The product price remains $79. The included coffee is a limited-time bonus.)

Product Features

  • Fits both SR540 and SR800 models

  • Improves bean circulation and airflow

  • Enhances thermal efficiency during roast progression

  • 10.25" chamber height

  • Includes high-temperature silicone base bands and midsection seal

Important Usage Notes

  • The SR800 is designed to roast up to 8 oz (226 g) of wet-processed green coffee.

  • The SR540 is designed to roast up to 4 oz (120 g) of wet-processed green coffee. 

  • Tip Sheets

Exceeding recommended batch sizes may clog the chaff basket and increase risk of chaff fire. Always monitor chaff buildup and adjust batch size as needed.

  • Do not leave the roaster unattended while in operation.

  • Stock glass roasting chamber and chaff basket are not included.

Specifications

  • Height: 10.25 inches

  • Material: Heat-resistant glass

  • Includes: Silicone bands and double-lip seal

  • Free shipping on U.S. orders over $150

  • International orders may incur duty charges at delivery/pickup

Warranty

Extension Tube and silicone components: 6 months (manufacturer defects)

Warranty void if used outside of North America.

Customer Reviews

Overall rating: 4.9295774 / 5 from 71 reviews.

AI Generated Review Summary

The SR800 and SR540 Extension Tube enhances roasting performance by allowing lower fan and heat settings, improving efficiency and quality. Customers appreciate the ability to roast at lower temperatures while achieving higher roast temperatures. The extension tube is praised for its ease of assembly and the outstanding service provided by the company.

Summary topics

  • Extension Tube Performance (14%): Customers raved about the Sr800 extension tube, praising its performance and ease of assembly.
  • Company Service (10%): Customers loved the outstanding service provided by the company, which was mentioned multiple times in the reviews.
  • Roasting Improvement (10%): It was reported by customers that this product dramatically improves roasting, with significant improvements in efficiency and quality.
  • Roasting Temperatures (18%): In general, customers appreciate the ability to roast at lower temperatures and achieve higher roast temps.

Review topics: [].

Review highlights

  • "Excellent service and product is as advertised." — Phil R.
  • "Dramatically improves roasting." — Robert K.
  • "Perfect fit and now i can roast the coffee more evenly." — Casey

Reviews

The extension tube is a

"The extension tube is a game changer for my Freshroast sr540!"

— John K. (5/5)

"Works perfect, a must have for an SR540 or SR800. Fast shipping and a nice deal with some free beans."

— Todd (5/5)

Changed everything

"We have had a couple SR500s and about 6 months ago got the SR800. After some frustration with the 800, we finally decided to get the extension tube. It has made a huge difference; more even roasts, faster roasting. Best investment we have made in years."

— Jodi D. (5/5)

Much Improved Experience?

"SR500 user graduated to SR800 over a year ago. Using stock chamber, never got temp above 385° and results were "meh". Roasted 4 different varieties of beans with the extension. It fits well, and bean movement was more manageable. Temps reached 450°! I need to tweak my roasting process to make my roasts sweeter. But initial results were markedly improved. I am excited to be at the base of the learning curve! Well worth the investment!"

— Robert C. (5/5)

Great addition to my roaster

"The extension tube is a solid addition to the Fresh Roast coffee roaster. I’m able to roast at lower temperatures with a lower fan speed. It allows more precise control, and hopefully I’ll get a longer life from the roaster."

— David K. (5/5)

Great replacement

"My original broke. Cracked in Dishwasher. Bought a replacement and received it quickly and well packed."

— Richard C. (5/5)

Roasing

"Excellent add on"

— donald r. (5/5)

Still working on it

"I love being able to roast a larger volume of green! I am still working on getting the heat and fan settings dialed in, as the narrower roasting chamber seems to concentrate the heat a bit higher up the tube. I have successfully turned a softer bean into a french roast by blinking for a second! Still very happy with the purchase, and of course the support from the kind folks at Home Roasting Supplies could not be better! ~john"

— John C. (5/5)

Excellent

"Great, prompt service!"

— Ben W. (5/5)

Creates a great roast

"The extension tube takes the SR800 to another level. Higher capacity and more even and smoother roasting. I’m just scared I’m going to drop it and break it (hasn’t happened yet!) Be careful with it."

— Elliot O. (5/5)

Q&A

I bought one of these. Where are the instructions?
Please email us and we can get a set email back.

For all orders exceeding a value of $150 shipping is offered for free.

Returns will be accepted for up to 10 days of Customer’s receipt or tracking number on unused items. You, as a Customer, are obliged to inform us via email (support@homeroastingsupplies.com) before you return the item.

Otherwise, standard shipping charges apply. Check out our delivery Terms & Conditions for more details.

IF THERE IS A NEED TO FILE A WARRANTY CLAIM

  • We will need the serial number, found on the underside of the base unit, starting with 540 or 800.  
  • Shipping or mailing address
  • Contact Phone Number
  • Pictures of the damage if filing a warranty claim for a roast chamber or top assembly.

IS YOUR MACHINE NOT HOT ENOUGH?

  • Verify that you are getting 120-122 Volts to the roaster without any extension cords.  
  • The ambient air temp is not below 55*F.  Cool temps will result in low heat output.
  • Make sure your roast profile includes lowering the fan speed as the beans roast to increase the chamber temperature.  
  • Running too few beans can result in heat not building up in the roast chamber.  Minimum of  3 Scoops, 3 OZ, or  85 Grams for both SR540 and SR800.  

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